# Mobile Client MAC Address **URL:** \ **Category:** Ignition\ **Created:** [March 4, 2019, 6:39pm UTC](https://forum.inductiveautomation.com/t/mobile-client-mac-address/23037 "2019-03-04T18:39:28Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![jlivingston](https://avatars.discourse-cdn.com/v4/letter/j/779978/32.png) [@jlivingston](https://forum.inductiveautomation.com/u/jlivingston)\ **Post date:** [August 7, 2019, 1:43pm UTC](https://forum.inductiveautomation.com/t/mobile-client-mac-address/23037/9 "2019-08-07T13:43:29Z")
In answer to both questions, the answers are to be found in the following abbreviations: A.R.P. and R.A.R.P. This is to say, that routers and such use Address Resolution Protocol and Reverse Address Resolution Protocol to query a given I.P. Address or MAC address if given the other one. Because you are frequently dealing with situations like D.H.C.P. ( Dynamic Host ) where the IP address changes according to what address just happens to be unused in a pool, you could obtain a list of possible MACs given a ‘nearby’ connection was made. With multiple machines and added Authentication, you have pretty slim chances with a mobile client. This can theoretically happen, yet I would not want to wait for a result or trust it through a WiFi system. Nearby means on the same physical Ethernet segment, etc. If you knew enough about the machine, you might start be reading the following forum post: [Windows CPU Temp](http://forum.inductiveautomation.com/t/windows-cpu-temp/26114) where bvaldinos asked about remotely reading temperature from a connected machine. Mr. Zx… knew of a Vision ( not Perspective ) way to query the hardware, and the similar post ( battery percentage ) has a link to a website with more information about hardware queries. --- _[View the full topic](https://forum.inductiveautomation.com/t/mobile-client-mac-address/23037)._